In many environments and applications, media-based direct evaporative cooling is effective in many applications and environments including data halls, penthouses, office areas, condenser pre-cooling, and gas turbine pre-cooling. This session will review these applications, then cover the basics of saturation efficiency and achievable wet-bulb temperatures. An examination of an average summer day with hourly graphs will show that the highest outdoor temperature coincides with the driest air. The session also will compare different cooling technologies including Munters’ FA6 and FP3 cassettes along with the MRM product line. It will describe how direct evaporative cooling can operate with zero discharge and provide detailed information on drift and mist eliminators.